Product specification
NR/PS/TEL/00015
Unit Twin Copper Telecommunications Cable (formerly RT/E/PS/00015)
Issue 3, April 2006 · Copper design & immunisation
Clause map — what each clause deals with
| 1 | Purpose | Procurement spec for PE- and ZHLS-sheathed unit-twin copper telecoms cable |
| 2 | Scope | What copper cable types and sizes the spec covers |
| 3 | Reference documentation | Referenced standards (BS 3573 and so on) |
| 4 | Definitions | Definitions |
| 5.1 | General | Conductor — solid annealed copper and the conductor diameters available (0.5, 0.63, 0.9 mm) |
| 5.2 | Insulation | Conductor insulation |
| 6 | Polyethylene Sheathed Cable | PE-sheathed (unarmoured) cable construction |
| 6.2 | Cable Core | Unit twin core construction and pair lay |
| 6.3 | Filling Compound | Filling compound |
| 6.5 | Moisture Barrier | Aluminium moisture barrier |
| 6.7 | Sheath Marking | Sheath marking legend |
| 6.8 | Maximum Cable Diameter | Maximum cable diameter by pair count |
| 7 | Polyethylene Sheathed Armoured Cable | PE-sheathed armoured copper cable |
| 7.3 | Armouring | Armouring tape |
| 8 | ZHLS Sheathed Cable | ZHLS (low smoke) copper cable — the variant to specify for runs inside buildings, REBs and tunnels. Note: the current NR/TEL set gives the building-intrusion length rule only for fibre (30160 cl 6.9.2/6.9.4); there is no copper clause with a distance — designers apply the same principle and the site fire requirements |
| 8.3 | Filling Compound | No water-blocking compound in ZHLS cable |
| 9 | ZHLS Sheathed Armoured Cable | ZHLS-sheathed armoured copper cable |
| 10 | Mechanical and Environmental Product Approval Requirements | Mechanical and environmental approval tests |
| 11 | Electrical Product Approval Requirements | Electrical approval tests — which pairs are tested |
| 11.2 | Conductor Resistance | Conductor resistance |
| 11.3 | Resistance Unbalance | Resistance unbalance |
| 11.5 | Mutual Capacitance | Mutual capacitance |
| 11.6 | Capacitance Unbalance | Capacitance unbalance |
| 11.7 | Attenuation | Attenuation |
| 11.8 | Near End Crosstalk Attenuation (NEXTA) | Near-end crosstalk |
| 11.9 | Insulation Resistance | Insulation resistance |
| 11.10 | High Voltage Breakdown Test | High-voltage breakdown test |
| 12 | Additional Approval Requirements for ZHLS Cables | Extra approval tests for ZHLS cables |
| 13 | Production Tests | Production tests and certificates |
| 14.2 | Drumming | Drumming |
| 14.3 | Supply Lengths | Standard supply length |
| 14.4 | Labelling | Drum labelling |
| 15.1 | Product Approval | Product approval before supply |
| 15.2 | OFCOM Approval | OFCOM approval |
| 16 | Safety | Safety |